Polishing or buffing wheel.



G. P. STEVENS.

`4IOLISHINGf OR BUFFING WHEEL.

APPLIUATION HLED oom. 1e, 1909.

Patented Aug.23, 1910.

* 9472177071 George?? 57E/e115:

,the centrifugal action of the wheel, which 'UNITED sTATEs PATENT OFFICE'.v

GEoReE P sTEvENs, or CHICAGo, ILLINOIS.-

POLISHING 0R BFFIN'G WHEEL.

To all 'whom 'it may concern.'

Beit known that I, GEORGE P. STEVENS, a citizen of the United States, residing at Chicago, in the county of Cook and 'State of Illinois, have invented certain new and useful Improvements in Polishing or Buiing Wheels, of which the following is a specification. l

Certain polishing wheels as now used coniprise a circular ring of felt, leather, or other polishing material, properly mounted on a circular core or base in such a way that practically all of the polishing or wearing material may be worn away in use before it becomes necessary to renew the wheel. Renewal is then effected by removing the remaining` portions ofthe wearing material from the base and substituting therefor, a new` ring of wearing material. The proper composition, design and arrangement of these wearing rings colnprise the mostl iniportant feature of such a polishing wheel.

As at present used, the wearing portion is generally in the form of rings or segments of felt, or other material, supported in an annular groove or channel of the base or core. These rings or segments are generally of homogeneous composition and are s upported upon the core entirely independently of each other. The polishing effect of the wheel is often improved by the application of powders or liquids to its peripheral surface, but it isfound that with the above described arrangement of the segments, such powders or liquids when applied to the periphery of the wheel, will notlast long, by reason of tends to throw them olf, and that they. will not give a uniform abrasive action. The type of base or core at present used, comprises a circular block of wood or metal provided with side plates of a diameter eater than the block, vso that they will pro- ]ect beyond the block, thus forming the annular groove or channel above mentioned. As now made, it is impossible to remove the wearing parts from the core without disassembling the wheel as a whole, thus, at times, causing considerable inconvenience in the renewal process.

The 'objectsof my invention are to provide a polishing body which can be madeeof any desirable degree of abrasiveness; one which will better retainpowders or liquids introduced thereon, thus expediting the Specification of Letters Patent. Application inea october ie, 1909. serial No. 522,980.

polishing operation; one which will permit the use of felt or other materials which have been discarded after servinga useful life in some other process; and one which .will possess a degree of coherence not heretofore attained in polishing rims built up of a number of distinct units; and also to provide a. polishing wheel which will not need vto be entirelydisassembled for the renewal of the wearing ring. Andv the invention consists in the features of construction .and combination of parts hereinafter described and claimed.

In the drawings, Figure 1 is a side elevation of an assembled polishing wheel; Fig. 2 is a cross sectional elevation of an assembled polishing wheel; Fig. 3 is a detail view in perspective showing the manner in which the polishing units or segments which I propose to use lie together; and Fig. 4 is or channel, within which the polishing rimi is supported. The core 7 and face plates 8 and 9 are properly drilled to receive the shaft or axle upon which they are supported. The face plate 9 is permanently attached to theicore 7 by means of screws 10, and thev face plates are held itogether by tap bolts or screws 11, which are countersunk in recesses l2 on the outer face of the plate 8. After passing through the core 7,

.they are threaded into inwardly projecting` bosses 13 of the companion face plate 9.

Patented Aug. 23, 1910. s

The segments composing the vpolishing rim are secured to the base by a plurality of pins 14, registering loosely at one end with holes in the face plate 8, and threaded at their opposite ends into the face plate 9. It will be seen that with this designof base, it is possiblev to remove the polishing rim by slightly loosening thel screws 11, `and then unscrewing and removing the pins 14; or the segments can be removed by entirely removing the screws 11 and the face plate 8,

leaving the pins 14 attachedto the 'face' lOj plate 9,' and then retracting the faceaplate 8 longitudinally along its. axis; or the segscrews 11 sui'liciently to allow the face plate i ments can be" removed by loosening the them greatly facilitated.

' The'type of segment or unit of wearing material 15, which T propose to use, is shown in detail in Figs. 3 and 4. As shown by Fig. 4, it is composed of two layers, 16

. abrasive side.

and 17, of felt or other desirable material. One side of this material should preferably have a more abrasive quality than the other side. To form one of my improved segments or units, two layers of this material are placed together, preferably with.. their more abrasive sides 18 in contact. They are then secured by. transverse lines of stitching 19 and are cut into such shape as ,to form the segmental units, so that when assembled in a continuous ring, they will present -peripherally exposed pockets 20. These units are then punched near their inner peripheries in such" a way that when mounted on the pins 14 of the base, the exposed ends ofthe pockets 2() will interweave as shown in Fig. 3, and a matched and interlocked wearing surface will be formed, having scattered over it a plurality of narrow pockets, which will retain against cetrifugal action any powder, liquid, or other abrasive substance, which may be applied" at the surface. Tn practice, the individual units may be cemented together, when they are mounted on the pins 14, so that when the ring has been completely assembled, the units will be securely attached to each other. This type of wearing segment contains several improvements over the present state of theart.. lt is seen that powders or liquids which are thoroughly applied at the periphery at the rim of a wheel made of such units will enter into these pockets and be vheld securely in them until the rim has been worn down, so that they become exposed on its surface. For the friction of such powders or liquids against the sides of the pockets will tend to retain them against centrifugal action. And further, the use of felt or other material, one side of which is of harsher quality than the other, will provide a polishin rim of any degree of abrasiveness desire", depending upon the thickness with which the roughening material is applied to, or impregnated into, the In the manufacture of these units,I use may be made of sheets of felt or other material which has been used in printing press or other operations, in which one side of the material has become impregnated With printers ink, or (any substance which Willpenetrate into it, thus rendering that side more abrasive than the other. This enables the/ use of waste materials which have been rejected after serving a useful life in some other process, and materially lowers the costA of polishing wheel renewals.

T claim:

1. A polishing wheel comprising a base portion, and a buliing -portion in the'form of a wearing rim, and comprising a plurality .of segmental sections adapted to be removably attached to the base portion and to present a substantially -uniform wearing periphery, the base portion comprising a hub and two side plates adapted to embrace said hub, said side plates being of a kdiameter greater than that of the hub, .there being a plurality of transversely extending holes in the hub near its periphery, .and there being a plurality of transversely extending countersunk holes in one side plate adapted to register with the holes in the hub, and there being a plurality of threaded bosses on the other side plate in register with the holes in the hubs, the holes inthe hub at that side being cou'ntersunk to receive said bosses, and screws passed through the holes in the first-mentioned side plate and hub, and threaded into the bosses of the second-inentioned side plate, said screws being countersunkv into the first mentioned side plate whereby a smooth surface will be presented on the exterior of both of said plates, there being "a plurality of transversely extending holes circumferentially placed in one side plate near the, periphery thereof and spaced beyond the edge ofthe hub, and a plurality of pins fixed to the inner surface of the other side plate beyond the edge of the hub'and adapted to register with said last-named holes, .whereby said pins span the s ace between the projecting edges 'of the si e plates ina manner to leave aspace betweenthe pins and the peripheral surface of the hub, and whereby the side plate provided with the peripherally placed holes may be di rectly withdrawn from the hub and pins when the aforementioned screws have been unthreaded, the aforementioned segmental sections of the wearing rims being provided with a-` lurality of transversely extending holes a a ted to register with two or more of the adiiacent transverse pins in the periphery of the side plate in a manner whereby said sections may be supported by said pins between the projectin edges of the side plates to revent them from being dise' aged radially from the side plates andto a ord a substantially uniform wearin periphery, said side plates, hub, se menta sections, and ins, being so relate that when the screws ave been unthreaded from the los @saisi bosses the 'countersunk side plate may be withdrawn and the segmenta sections adjusted on the pins, substantially as described.

2. A polishing wheel comprising a base portion and a buiflng ortion in the form of a wearing rim, an comprising a plurality of segmental units adapted to be removably attached to the base portion and to present a substantially uniform .wearing periphery, the base portion comprising a hub and two side plates adapted to embrace said hub, the side plates being of a diameter greater than that of the hub, and attaching means whereby said side plates are attached to the hub in a manner such that one of said side'plates may be removed, all .of said attaching means being of a form to present a. smooth exterior surface on each side plate, there being a plurality of transversely extending holes circumferentially placed in the removable side plate near the periphery thereof and spaced beyond the edge of the hub, and a plurality of pins ai'iXed to the inner surface of the other side plate beyond the edge of the hub and adapted to register with said'last named holes, whereby said -pins will span the space between the projecting edges of the side plates in a manner toleave a space between the pins and the peripheral surface of the hub, and whereby the side plate provided with the peripheral holes maybe directly withdrawn from the hub and pins when the aforementioned attaching means have been disconnected to permit the removal of said side plate, each of the aforementioned'segmental units comprising two similar sections of suitable wearing material joined together by means of lines of stitching extending in a substan# tially radial manner from the inner edge of the unit to the outer edge thereof in Va manner to provide a plurality of substantially radial pockets, each unit being provided near its inner edge with a plurality of transverse holes in position to register with and engage the aforementioned pins, the said holes being spaced in a lmanner whereby the aforementioned pockets will break joints when the units are assembled on the pins, whereby when all of the units have been assembled on the pins to form the wearing rim they' will form a substantial uniform wearing rim presenting a substantially uniform peripheral wearing surface having therein a plurality of substantially radial pockets breaking joints and adapted to recelve and retain a buiiing material applied at the peripheral surface of the rim, substantially as described. p GEORGE P. STEVENS. Witnesses:

FRANCES M. FRosfr, SAMUEL W. BANNING. 

